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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdde0bea8d35a5df6a3669357d86776dfc8ab2a8b1fbe2c3eda22ce9f7b836e' 
  AND token = 'eH+/OjG3CDP+LZRO99en/sOA3e5zMe3kijC29+yw1hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}